ORBi: Vertruyen Bénédicte - Electrical transport and percolation in magnetoresistive manganite/insulating oxide composites: Case of La0.7Ca0.3MnO3/Mn3O4

Reference : Electrical transport and percolation in magnetoresistive manganite/insulating oxide comp...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/2268/1752

Title :	Electrical transport and percolation in magnetoresistive manganite/insulating oxide composites: Case of La0.7Ca0.3MnO3/Mn3O4
Language :	English
Author, co-author :	Vertruyen, Bénédicte [Université de Liège - ULg > > Chimie inorganique structurale >]
	Cloots, Rudi [Université de Liège - ULg > > Chimie inorganique structurale >]
	Ausloos, Marcel [Université de Liège - ULg > Département de physique > Physique statistique appliquée et des matériaux >]
	Fagnard, Jean-François [Université de Liège - ULg > Dép. d'électric.]
	Vanderbemden, Philippe [Université de Liège - ULg > > Capteurs et systèmes de mesures électriques >]
Publication date :	2007
Journal title :	Physical Review. B
Publisher :	American Physical Society
Volume :	75
Issue/season :	16
Pages :	165112
Audience :	International
ISSN :	1098-0121
City :	College Pk
Keywords :	[en] electrical resistivity ; percolation ; manganite
Abstract :	[en] We report the results of electrical resistivity measurements carried out on well-sintered La0.7Ca0.3MnO3/Mn3O4 composite samples with almost constant composition of the magnetoresistive manganite phase (La0.7Ca0.3MnO3). A percolation threshold (phi c) occurs when the La0.7Ca0.3MnO3 volume fraction is ~ 0.19. The dependence of the electrical resistivity rho as a function of La0.7Ca0.3MnO3 volume fraction fLCMO can be described by percolationlike phenomenological equations. Fitting the conducting regime (fLCMO > phic) by the percolation power law rho # (fLCMO - phic)^(-t) returns a critical exponent value of 2.0±0.2 at room temperature and 2.6±0.2 at 5 K. The increase of t is ascribed to the influence of the grain boundaries on the electrical conduction process at low temperature. (C) 2007 The American Physical Society.
Research units :	Services Universitaires Pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - SUPRATECS
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Union Européenne = European Union - UE = EU
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/1752
DOI :	10.1103/PhysRevB.75.165112
Other URL :	http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000075000016165112000001&idtype=cvips&gifs=yes

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